Update units in docstrings to per-unit

[BSnelling]

No description provided.

[codecov]

Codecov Report

Merging #8 (d687aa6) into main (135b2ca) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main       #8   +/-   ##
=======================================
  Coverage   79.59%   79.59%           
=======================================
  Files           2        2           
  Lines          98       98           
=======================================
  Hits           78       78           
  Misses         20       20           

Impacted Files	Coverage Δ
src/accessors.jl	98.38% <ø> (ø)
src/system.jl	47.22% <100.00%> (ø)

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